There is no one single answer to your question. Two 6-volt batteries in series will give you 12 volts. CCA will depend on the size of the batteries used in this configuration. CCA will not add, but will be equal to the lesser of the two batteries if they are not the same size. ' Two 12-volt batteries in parallel will still be 12 volts, but the CCA will be equal to the sum of the two batteries used. So, two BIG 6-volt batteries CAN be better than 2 smaller 12-volt batteries. But, in general, the 2 12-volt batteries will probably be better simply because they will be higher capacity. The real answer is to look at the sizes and ratings of the batteries in question. The preferred setup would be the ones with the higher capacity CCA.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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